A31 コントロールモーメントジャイロ搭載人工衛星の耐故障姿勢制御系(M-OS13-7 飛翔体の制御,M-OS13 宇宙機・宇宙ロボットのダイナミクスと制御,「海を越え,国を越え,世代を超えて!」)

Abstract

In recent years, it has been required accurate and agile attitude control of satellites. For this purpose, the necessity of Control Moment Gyros (CMGs) has been increasing, which can generate much higher torque than reaction wheels which are used as conventional spacecraft actuators. Furthermore, it is important for the attitude control systems to have function of fault tolerant. In a conventional 4 CMG system, the CMGs are placed in a pyramid mounting arrangement with skew angle set to 54.74 degrees. The maximum angular momentum of the CMG system is changed according to the skew angle. The suitable skew angle should be designed considering normal and failure situations. Moreover, the suitable parameters of the satellite attitude and CMG control system are changed according to the skew angle. Therefore, this paper proposes a design method of the fault-tolerant attitude control system. In the proposed method, the skew angle and the parameters of the control system are tuned simultaneously by genetic algorithm. To verify the fault-tolerant of the proposed method, numerical simulations in case that the one CMG is failed are carried out.